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We argue that, as a consequence of the graviton's spin-2, its bremsstrahlungin trans-planckian-energy ($E\gg M_P$) gravitational scattering at smalldeflection angle can be nicely expressed in terms of helicity-transformationphases and their transfer within the scattering process. The resulting spectrumexhibits deeply sub-planckian characteristic energies of order $M_P^2/E \llM_P$ (reminiscent of Hawking radiation), a suppressed fragmentation region, anda reduced rapidity plateau, in broad agreement with recent classical estimates.

Emerging Hawking-like Radiation from Gravitational Bremsstrahlung Beyond the Planck Scale